<template>
    
        <div class="container">
        <div class="item1"></div>
        <div class="item2"></div>
        <div class="item3"></div>     
    </div>
</template>
<script>
export default {
    data() {
        return {};
        
    },
    
};
</script>

<style scoped>
.container{
 display: flex;
 flex-direction: row;
 height: 100%;
 background: #ccc;
 justify-content: center;
 align-items: center;
}

.item1{
 width: 100px;
  height: 100px;
  background: red;
  
}
.item2{
  width: 200px;
  height: 200px;
  background: blue;
  
}

.item3 {
  width: 300px;
  height: 300px;
  background: green;
}
</style>